[quote name='Shockwave' post='801252' date='Apr 9 2010, 08:56 PM']Ok, when it goes quiet, i hit the amp, and it gets louder again for a brief few moments. Valve Reseat? Transistor come lose?[/quote]
I have the schematic somewhere. What I can recall the only difference between bright and normal inputs is a low pass filter, possibly separated with a buffer. Shouldn't be a big issue, most probably a bad solder. Will check.